Category:T-Spin Methods

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This category lists T-Spin methods. Articles in this category generally depict strategies involving twists with the T tetromino.

[edit] T-Spin Recognition Algorithms

Some games give scoring rewards for twisting a T tetromino into a tight space. Two basic algorithms, with slight variations, have been used in newer games to detect and reward in-place spins:

Immobile, used in The New Tetris: A T-Spin is recognised if a T tetromino locks in a position where it cannot move left, right, or up. There is only a reward if rows are completed in this way.
3-corner T, used in Tetris DS and other SRS based games: A T-spin bonus is awarded if both of the following are true:^[1]
1. Last successful movement of the T tetromino was a rotation, as opposed to horizontal movement, downward movement, or falling due to gravity. (Canceling lock delay in games that allow it, such as Tetris DS, does not count as a movement.) The tetromino doesn't even have to end up in a different orientation than what it was dropped in.
2. Three of the 4 squares diagonally adjacent to the T's center are occupied. (In Tetris DS, the walls and floor surrounding the playfield are considered "occupied", while in Tetris Worlds for GBA, they aren't.

Different games add further restrictions:

3-corner T no wall, used in Tetris Worlds: The walls and floor surrounding the playfield are not considered "occupied". This means that if a wall kick places the T tetromino with its flat side against the wall or floor, the T-spin will not be recognized. (Kicks that place the flat side against blocks in the playfield still work.)
3-corner T no kick, used in Tetris: New Century, iPod Tetris, and Tetris Evolution: The final rotation must not involve a wall kick, that is, it recognizes only the "well known twist" below.

(The names for the algorithms are unofficial, taken from the fan game Lockjaw.)

In recent Tetris games, wallkick T-Spins, or kick T-Spins, have been depreciated in favor for the new no kick rule. Kick T-Spins will not be recognized or rewarded in newer games.

A couple of 3-corner T no kick rulings variations: